To add an extra day to one of your workouts simply edit one of your workouts; hover over the 'Diary' tab and select 'Activities' from the drop down menu. Select the 'Create your own workouts' button to view all of the workouts you have created and select the arrow of the workout you wish to add the day to.

The 'Add Day' button can be found next to the 'Save' button at the bottom of the screen. Add as many extra days to your workout by clicking the 'Add Day button repeatedly.

Please note: You can only add an extra day to the workouts you have created yourself in 'My Workouts'. If you wish to add extra days to an existing Weightplan workout you must first copy the Weightplan workout into 'My Workouts' where you will be able to add extra days.